cli/packages: fix update output on unpinned packages

- don't print output of git command
- count commits and output log

core/cli/packages.el

@@ -402,9 +402,10 @@ declaration) or dependency thereof that hasn't already been."
                      (print! (start "\033[K(%d/%d) Fetching %s...%s") i total package esc)
                      (doom--straight-with (straight-vc-fetch-from-remote recipe)
                        (when .it
-                         (setq output .output)
                          (straight-merge-package package)
                          (setq target-ref (straight-vc-get-commit type local-repo))
+                         (setq output (doom--commit-log-between ref target-ref)
+                               commits (length (split-string output "\n" t)))
                          (or (not (doom--same-commit-p target-ref ref))
                              (cl-return)))))